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> Beings that have been around me since childhood that refer to me as their little sister
I can only guess who you are, and the connection wasn't easy to find but my verdict is: They're angels.
I don't know what view you have of them so I'll just say it as I see it; angels come in two versions, "lawbound" and "fallen".
Lawbounds are attached to the first moment of creation and see any following events as "degenerated", they are afraid of the progression of time and they are afraid of learning and personal experience. This leads them to only repeat religious texts mindlessly and attack blindly anyone who talks or thinks from the perspective of personal experience.
Fallen angels are those who accept that time moves and that the initial second of creation, while "pure" in a sense, was just one second and it is still there as the beginning of it all. They will study texts for meaning and learn personally.
The angels I came into contact with are "fallen".
"Angel" refers to a certain way of thinking and acting, reflecting in the being's DNA. An old vampire is very similar to a "fallen" archangel in mindset, only the colours of their energy differs.
A succubus is someone who learns from experience and holds no fixed morals, so a fallen angel or a vampire can also be a succubus.
I hope that helps.